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Earth, Planets and Space
Fig. A.1. | Earth, Planets and Space

Fig. A.1.

From: Subtle changes in strain prior to sub-Plinian eruptions recorded by vault-housed extensometers during the 2011 activity at Shinmoe-dake, Kirishima volcano, Japan

Fig. A.1.

Detection limits of subsurface volume changes by using extensometers at 20 km away from the epicenter (circles), and by using GPS installed at an optimum point (triangles). The extensometer is assumed to be set in the radial direction from the source. GPS measures the horizontal displacement. Resolutions of extensometers and GPS are assumed to be 1.0 × 10−9 (dimensionless) and 1.0 mm, respectively.

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